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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f945a64b37f1d6d51e19d10c700d5e386abf11d9af202d2239091a95a49794b1' 
  AND token = '/i6C3pmTlV1BaBDae9EVZNifE7pr8WRY32FRI0NX2VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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