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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40f972a5c353061886a077983c0e9b9ba6fd3fad680a0435361896cfe17f274' 
  AND token = 'srRU4kAkBT+slcYOo7LjmWVz+EeDd3Q0Y85ooQ9uBEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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