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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee498a1b7d44cb15da4b1c6d348e422d2aca67858e7913b714d3b3f0b2bc827' 
  AND token = 'BAtWpyNZ/7LChG8/gQI1hqXMQP26344JSj/L3CIDfro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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