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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bb8a33ef44e53b26eee835238d242551becbb0033215c8fd4cfd5a3cb52eaa' 
  AND token = 'HXurd6bLHXOZ26Px6zh1kM992s/CHFEFOI4sx5vLvEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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