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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf10088292f5bae6b6d0413954eb1404a872c3beb79625800ac5c3be37012fff' 
  AND token = 'exQ/PreK3sSsChPNi+An5rJbmCr+i0FJZbqQSa1gDr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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