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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438b3f59253088e4b6f1945d97898b6c3e80eca60d93058d1984f2aa1ca951fa' 
  AND token = 'vNN1aRmV1+brWF5zWYSYxzGboVD33z0PXTcUFlNELTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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