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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3195807cd13a74a9217a78e0e5e51a6cdab0f2e44cebd22ced910db28197db7f' 
  AND token = 'lOjkAB/N1gCymHP7cJuVETo0M9sxl9F0teX8Ek+0I9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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