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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f50bf911027649b105bd9a1bee57d2e7168d935e29f6b29d18727237af36e6d' 
  AND token = 'v108i27a9xmBUeS4CTQB1G2Yc6wTrUH40YyQjPmWPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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