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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd762aa7dd3d6ce3c3972d5d2a530b6f8828003d4ce5a4730af004c9e5126e06' 
  AND token = '4d/qAFzjAXO5N1P2KsdAWoiwzb/rBrGEvyI6OFxLXdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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