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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3692698c546270fdb46560500ebd4e32c0e833319a633e71c070ef69dba8a11' 
  AND token = 'BICW2fSY/E8v3ElUeAA9nnzuzKdmgYk7bvO/3birnTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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