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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d812eac482f675d4c7c47dec3b3bb5c84ec952b1c002f10ef6ddd231f13096c' 
  AND token = 'M70z/29nPrSOuzoUhQkthxhFEXCIvmVci+uv8tdzYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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