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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04aac1dc4d7ab75e82f2e3b1adacc74bfbc607ee35bfda71c555154b30618c06' 
  AND token = 'Wwly81RwY1nR6LMmCVxT2xllgKKPS1TVPEQOU5kEkQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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