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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2788c9aa33d46b4c65832c2e87a9d25e051177a3ae3f32bb89a3f6c7f4c1e4c2' 
  AND token = 'JRT7E4BxArkI0NGEwS6md2fDo1WGzPP8cJLxECdrohI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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