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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd533849bca5d94278fb7c5db47212d01b993d5309288720ef5dfb4297bb6fe2' 
  AND token = 'X3EsRaQDVl/xpmGb4W8dwXEv2K9b7zmTfYEj+95XKo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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