SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b0d5d67a3fc90458b4f16211656ce0f40dc426fef3dda39295c90ca7445f70' 
  AND token = 'sF8VjwRtvACt/3Zgy+q/KnFSS2Zly71mrKa7s0PY95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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