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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0b44c2358ae3c7963c156fb9ac936286682aaad74dba44aab6d80342183a52' 
  AND token = 'YjuIgUeS86Uc+DTYZhzoiNEfxPF7eLwYaLAMDqiV1uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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