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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9d2bb99eae27c13de12fb6e2725ca6cd8b30199778dfa187b630ce5b53c371' 
  AND token = 'abpTJxeKaMi2jlFo09vJCHB9w4pdGbl4wJZ8rtQgWIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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