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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003d498f7c0b60b2050260df324f2cf9c35eda278b306bfddcedf9a5370bab3f' 
  AND token = 'RYTaO4Tt0WWZ1vwQKpE7H7Enu3eR8tTpNIOYkpJIIdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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