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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6874a73aa044f6ebfed80a70cd1ebf1b98c60ae9812b0b46a030f5fbecef6be6' 
  AND token = 'fwKRP5gccB1wUq86xMEU0406EaCz2rJz2hZ8D5/Yss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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