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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bef3c75ae0d866069cf2218c39559de9c70c2a82ed799e053c298115ed6806f' 
  AND token = 'cXnXc2S6zoTJ5KCyzqCHGG5hkkA95RYcwem7i36LQ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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