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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184f10f2751ce62fe1d25c2bbded082ce15e39ea238bf4fcc5091b141603a345' 
  AND token = 'WZ8JZdidYJ9fIx3hD/GiV38NEZDgcrBS36E++Uy4wzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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