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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8a09c90a2ab6b5671b02a2d22fe89e1d08050efc8606ba19785e672d0c2c39' 
  AND token = 'bo04zC3euYBY6Qrs1Kgfy6ZSmVjnI+9gXlUy3rIFChI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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