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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88527ce4ec97a29b9f698c1ce22546ca641c0a9ddffc6c5f6ee7c66cb3b1c9e5' 
  AND token = '8e0DsBA6AgxhbEmQ5t0gU254umMCAJAU0Niz3Tb+UEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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