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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ffb3fcae9122c0db5c6f5c2455749e3bc4cf444aaf75c4621279d98aee44a' 
  AND token = 'N/lVrgq4kg7Wk3V6a8bybX2cYO4nkq9auU7H8WkjOzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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