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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a02f488bcf54d8d9cdecac2c3f8c0515b54f5390f964f3529844da47eea9c7' 
  AND token = 'hQ95hIwNM530l1Y9lZ8mAVVue+S1tOsOgWeIY5H2+vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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