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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6533057a6fcd6c6a39c5e4fa500a6a1779d46ff87c2d969cbf3d7a0523a2956' 
  AND token = 'Q7oisTgKhge6VSYVMVIhbb0sH7L7/+jEs1RoHsJGf3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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