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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0864cf248dbca4f13667ce6ebdb5f9683aef8b41f7a14c585e70f967ab6c1f0' 
  AND token = 'jiNsaQI/jGvqXbzspkE3yqJzwK+Lh5D9d5W66+yeM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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