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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcb3483d2430eabf58394bde5e3a35cca6cbbee4d3bc167d592665c20593dea' 
  AND token = 'bD6Bn7tBsv0z43U8PiknL03+AoY/Y3AYqlY9cJwotdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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