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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb82f7e6994d43eb9bdcf7dc765c3e4ea55d108d4d758b432b5b78d40ee4cdbe' 
  AND token = 'ei3tq+RprQKCpg9yE7mt0ffjFX4NxV1syXLnlyHvnOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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