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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5ec2dfca52cc8a45af8ded0eaf21364c5cdbffcb2e11e7901e47a9d2d424c8' 
  AND token = 'ZptMfyDpS1XtbFtFjBkcmJH4GlGY45G80bLaVe/5BNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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