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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a01007c46d01875d9a297c1f88ed057a88f304ac31b754eb7894884ec5f8b9d' 
  AND token = 'Dr5Qw4Sx5zpPFggXOveLkBy9O8yXm8bkcRGGkCXXdTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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