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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30bd1677c8ba4ad92f9b168b3fa6288bc4cf07e87fee72fde90421b4fd0187c' 
  AND token = '+0T/s62+Xpu9qAoiHV2I1+vjKSykoGxJ2UCT6WtEjd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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