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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841dcbb5e9bef8862eb7912893bde85cefc8c86f2c92a430d0f0b78037b2fa2b' 
  AND token = 'up09tISeOK3DePKeV25H0rYj6A/5/ZsIOND3u15p+m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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