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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38292ffb25c5545d24135d2d6e9b1425f1205bb68a0f17a8b6afc80b72ab5073' 
  AND token = 'mpEbys6+Qobjc8gtX5jO1QHVBdzTd6d0h3cDEeh1q5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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