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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8049c1e781bf42bad842698045e4df07ee1410640557169afceed8661082ff4c' 
  AND token = 'iLWYdpGbWUMIN2vVroUvW/KZWc5SWktL02xLCZjgQyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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