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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc826c5701fce216e7ce5a00b877dc944ecb92cf36f9b502db02f05a05b1f307' 
  AND token = 'o/95tpTO9wTyFb3NoqkKvh6L1s7czQlepFZ3xslroms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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