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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f362d73f761cb03f1a7663b0f93323f01da7af8eaea171736c8fba11cc516f' 
  AND token = 'XN2GopSSpy+jh6/WXrCT8JkHKmg2Gx4K8uCG7w58kTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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