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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884a3c98c3f02f20dc65ab0e62896e660f7a0fccc1bf2797cf097e60eaf0e9c0' 
  AND token = 'zzxbh0A3Zij+E9znfW/b4suEk60u3pjsilkAniiNdzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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