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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5caf48cd45acd07e8001c0365082ba2f03c1efed8b43763e7d7704c685d506b9' 
  AND token = 'mQF4YbJW5thgTsVOOXtlXW4L2ukjP4WnE24KhK8Xx5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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