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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b8c7f8a21c29294c7d6e8257426cf7b9c0f94fcfaf4c9d26b59d8c37bf5fa4' 
  AND token = 'XaBbvxIFPaN78n+9TirKU1hA43l6JcUxZHOGLHhF5LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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