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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c83e5b2c17a5c2238a751750576d6453e2cbab000aabdf0c09fb11ca3759684' 
  AND token = 'ekVMtb6TrAEli1kTxAcfYJAOLHmRM1vZ2LQXs8sccbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}