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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bebc98d16a419b1bc011c3504f279c8afc84c7f4e1ac187ef6d63e20fe47df' 
  AND token = 'lWZyw9POk7mWF74Cwu/vPKiCNYPob8YL40YRbVYpVIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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