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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd68a461e2025210579a339d2ff389bb687bde11198f8940fd96ca4a1cbf284' 
  AND token = 'Q1Wjh6tFM5Ewm5NSEZ5EF5vhwIb0383eNAyoCRgY+Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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