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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6386c0f847b54df7de0104db8fb46c012f0506a6d823f3d654e3967d7483c307' 
  AND token = 'fNkubJKQGhiC+pE4KtS4ClEI9lIHs2pKq97Qm6E7jQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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