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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe7ef1c6f551c1651e08cefc772d53c666d1c12ff6760cb67707f3521677721' 
  AND token = 'Lj+LBndEowR/dkvPMrKQOMWgvIFE2JytC8JXG1S3eX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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