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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97339baf5b3fc65b452abf1559308d5bf04fe179f3299fa9e5238e9bca1f1a3a' 
  AND token = '+IIyLe03TmmrwnkqVAF/RIqg+IHmT8czveuCN1DD/Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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