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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c19b7746993b3b589dbb65236051197bf10012db56009d74705b768f1059063' 
  AND token = 'Kxf1yb0/nrW1xnp+2Fu9cI71MSi9h/BgNfWiNCR4zRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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