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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e07aeaedcfd3973881707b90c8c3309277f1c3ca3136f494af2da7b9efce64' 
  AND token = '7t54DqlyKBasDLljy6okaqgS0xah8QCUzWMAIxqo9DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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