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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b971f58d891fbeae8ebee530cf6c327dbc1435c159ba900b36e4a2d9a5ec474d' 
  AND token = 'dy3/rlknYaXI29j2EufJYB6N0hqv/6rahgoqHDXN6oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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