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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404294417afdf5acdb68faea895b56308ca5187b634c3c8378f97d6129119134' 
  AND token = 'ha5KyHeh982kTNWuE/Y2n0/tpEpi2RQG+ne5wy96vYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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