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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd5426272b7775a3fb88e924d2807781d86170df4def23293ff4187ec2ee88b' 
  AND token = 'RDKzfq3Ffcp7otad/H3F3MGu3C+7YSMHvLc5mTlr3so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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