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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e621d930f9e0b8b2a0b22d56f54feb25d3a97a67e211942d875b187c96792b' 
  AND token = 'HEqQhymMyr8JKsHvTct/CtriKbVHG5iLooU3GTtBUXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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