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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854df9fc7c5dab1a23b4edd523a54c5f3423a7d2d93fb65b3b895722feb4026f' 
  AND token = 'HS6cjDoBvLM2Chiq4iN6eb3RvTjEqetVD0idsjPY/lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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