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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f08f6fabebac703ff4899c943b907d5a1d5b681278475d86dbff864a855769' 
  AND token = 'aLaooXxvmLIQlTuYgGvnVOjQn66r4ZDo0sv5sm44uGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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