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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07feeffde80401ab67d10858b6124f326eb66892b5ede333545dfba699afb14' 
  AND token = 'jKBc0Q8GzBLnD0QZ5rsuu0fbIlT3cbx5h789rEkomTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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