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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1106c9244eab40e28b04979d3874137e1083a109c634cceba20ccc92ab64bb3e' 
  AND token = 'S9k2GZcJ6sxfRfm87keHitw+z4ZsdjD1Ivy7RvIA/jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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