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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0027e421f9f4b89545518a9a983786a1c7ba482a4e11c4788fb3c9bd6867649e' 
  AND token = 'oxsWgJTe1Widm1kOGKyJ45/9kXykhTAgcsa/g3iBj1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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