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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bd10a78d3695b883f676ed44a77ca070716555b91865db324d273e6df72b0d' 
  AND token = 'f7ItlSOn3TDdzz9u/zFGZvhY9OuSby3aScIQikfnXQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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