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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2d3690a5448c8fee61904b20f9804855db28e28b3be6900ca3110819bfbc23' 
  AND token = '9fjCX1EYxmdrHsANbbHoFTFT0dffLRjBua9V5W1JIrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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