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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29049d69ad1051a1faf8f1452f6b122e99055b9fc45b4a124017995d5831f3e0' 
  AND token = 'zinadeVsY06lGgek/WwulkqFGMpgaf82thb3jdZ8Sr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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