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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab278c96cf40690fbcc37ce6857e15895674a1acbd21eeaf83793102d301488' 
  AND token = '28Xl1Bjy1w53DEp9GmWODCUU9m94pXXoPph12qtA2fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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