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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f2add6d0839fc262d2a20036cc5caff91e84e3902ef7d6b03cf3afc74883a5' 
  AND token = 'cTQ+47h8BsD2ExZJ52YMiUn/9r5OlUjqlwnbeEn+UCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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