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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997f2343daa7aa24e9a6cb8aad43d1e34a4ed4dc91ff830bb88be17016ce0edc' 
  AND token = '/nwy3woeVIJMVaErCjvKaP9BTT7t9eUMjiBNPmCeSmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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