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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c7fd89bddf6e49929a74cec52d709c5e22ed87750eb874096d51ce02974ba3' 
  AND token = '2BOwOr2tSOz5190TTqIvT2yN4/myxh+aHxJ/8leByNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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